X-ray recording system for differential phase contrast imaging of an examination object by way of phase stepping

Abstract

An x-ray recording system is for differential phase contrast imaging of an examination object (6) via phase stepping. In an embodiment, the x-ray recording system includes at least one x-ray emitter (3) for generating quasi coherent x-ray radiation; an x-ray image detector (4) with pixels arranged in a matrix; a defraction or phase grating (17) arranged between the examination object (6) and the x-ray image detector (4); and an analyzer grating (18) assigned to the phase grating (17), wherein the x-ray emitter (3) the x-ray image detector (4), the phase grating (17) and the analyzer grating (18) for the phase contrast imaging form components (32, K1 to Kn) in an arrangement. According to an embodiment, at least one measuring apparatus (34) for determining deviations in the geometric ratios of the components relative to one another from the geometry target, an analysis unit (35, 40) for evaluating the measured deviations, a computing unit (36, 41) for determining correction values and at least one correction device (37, 37, 42, 46) for setting the geometric ratios of the components (32, K1 to Kn) are included.

Description

technical field [0001] The invention relates to an x-ray imaging system for differential phase-contrast imaging of an examination object by means of phase stepping, said system having at least one x-ray emitter for generating quasi-coherent x-ray radiation, with an array arranged in a matrix The X-ray image detector of the pixels, the diffraction grating or phase grating arranged between the inspection object and the X-ray image detector, and the analyzer grating correspondingly equipped for the phase grating, wherein the X-ray radiator, X-ray image detection The detector, phase grating and analyzer grating form the critical components for phase-contrast imaging within a given device. Background technique [0002] Differential phase-contrast imaging is an imaging method that has recently received much attention, especially in Talbert-Law interferometer applications. It is thus described, for example, in the publication F. Pfeiffer et al. [1], "Hard X-ray dark-field imaging ...

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Problems solved by technology

Changes in the distance between components in other positional orientations as well as tilting, rotation, etc. required to produce an image can lead to erroneous imaging or even complete failure of the imaging

[0027] For medical applications where high-precision optical benches cannot be used, and here in particular for potential applications in angiography or surgery where an X-ray system with a C-bow arm can be used, as for example according to figure 1 explained by figure 1 In general, continuously changing forces (gravity, centrifugal, etc.) and the corresponding components, so that the conventional mechanisms used today are not adequate, since inaccuracies of up to a few hundred μm or more can occur here

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